One of the critical issues that keeps being brought up in the dispute over Chabad is that which is stated below by Rabbi Oliver - a Chabad teacher. Namely that one can not criticise Chabad because you don't know it. If you knew and understood it you would not criticise it. Also if you look on his blog you will notice that he says that tzadikim are infallible. [See the Chabad forum which discusses this in great detail] Thus it is impossible that the Lubavitcher Rebbe was wrong. Consequently Chabad has an in impregnable defense. If you don't accept these beliefs you can't understand them and thus your criticism is a result of your lack of understanding. If you understood them you would not be criticizing them. Furthermore the tzadik or rebbe simply can't err and to state such means you don't understand what you are talking about.
Regarding the issue of infallibility - while it is true that non chasidim as well as chazal acknowledge the possibility of great people erring - is it really so that all chassidim view their tzadik or rebbe as infallible? I came across the following citation by the Sochachover Rebbe in his classic work Eglei Tal who was in fact a chassidic rebbe - the son in law of the Kotzker Rebbe. He says in no uncertain terms that Jewish authorities are fallible and that is one of the major differences between the Jews who accept that their leaders are fallible and the non-Jews who view their leaders as infallible.
Regarding the issue of infallibility - while it is true that non chasidim as well as chazal acknowledge the possibility of great people erring - is it really so that all chassidim view their tzadik or rebbe as infallible? I came across the following citation by the Sochachover Rebbe in his classic work Eglei Tal who was in fact a chassidic rebbe - the son in law of the Kotzker Rebbe. He says in no uncertain terms that Jewish authorities are fallible and that is one of the major differences between the Jews who accept that their leaders are fallible and the non-Jews who view their leaders as infallible.
אגלי טל (מעינה של תורה חלק ד' עמוד יז) ד"ה ואלה שמות בני אהרן הבכר נדב...אלה שמות בני אהרן הכהנים המשחים (ג- ב,ג) כפילת לשון זו למה? ברם, בידוע שכהני הדתות של אומות העולם נחשבים לברואים על אנושיים, שלעולם אינם עלולים לבוא לידי טעות. לפיכך משמתמנה אדם מהם לכהונה, מיד נותנים לו שם אחר, להודיע בזה שכלל איננו אותו אדם שמלפני כן וכי ניתן לו עתה גוף אחר לגמרי, ואילו אצל בני ישראל שונה הדבר תכלית שינוי, אפילו האדם היותר גדול נחשב בם הוא לבשר ודם העלול לבא לידי טעות, "אין אדם צדיק בארץ אשר יעשה טוב ולא יחטא" וכן: "הן בקדושיו לא יאמין". אף כי מחוייבים אנו לנהוג כבוד בתלמידי חכמים, הרי זה רק בזכות התורה שהם לומדים ומקיימים, כשם שאנו נוהגים כבוד רב בספר התורה, אף על פי שאין היא אלא קלף רגיל, מפני שעל הקלף הזה כתובים דברי התורה הקדושה: אולם אין אנו גורסים כל עיקר כי החומר גופו שונה מהחומר של שאר בני אדם. הילכך, אחר שמנה כבר הכתוב את שמותיהם של בני אהרן, הריהו חוזר ואומר: אלה בני אהרן הכהנים המשוחים" - שאפילו אחרי המשחם ככהנים לא ניתנו להם שמות אחרים, כי אם נחשבו לנבי אדם כמקודם...==========================================
Rabbi Yehoishophot Oliver comments to "Chabad III - R' Belsky vs R' Miller & R Heineman/M...":
The idea of emphasising the emunah in the Tzaddik in a way outsiders might think is exaggerated is not unique to Chabad, but is found in the entire derech of Chassidus (and in many respects, it is found in non-Chabad circles to an even greater extent).
In the Chabad approach this belief has taken on a specific form by Chabad Chassidim all based on explicit statements of the Rebbe himself concerning his holy father-in-law, in which he modelled for his Chassidim the proper approach of emunas Tzaddikim that is expected toward a Chabad Rebbe.
Those who are not chassidim altogether who blithely criticise from the outside simply demonstrate their ignorance on the subject at hand and their failure to study relevant sources concerning emunas Tzadikim in general, and the Rebbe's words concerning the proper emunah expected of a Chabad Chossid in particular. Don't condemn what you don't know.